DESIGN principle in Java

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DESIGN principle
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Visually communicate pliancy.
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There are three basic ways to communicate or hint at the pliancy of an object to users: by creating static visual affordances of the object itself, by dynamically changing visual affordances of the object, or by changing the visual affordances of the cursor as it passes over and interacts with the object.
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Object hinting
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Static object hinting is when the pliancy of an object is communicated by the static rendering of the object itself. For example, the three-dimensional sculpting of a button control is static visual hinting because it provides manual affordance for pushing (see Figure 19-3). For interfaces with a lot of objects and controls, static object hinting can require an impractical amount of rendered screen elements. If everything has a threedimensional feel to provide affordance, your interface can start to look like a sculpture garden. Also, static hinting requires that objects be large enough to accommodate the creation of affordance. These impracticalities call for dynamic visual hinting. Dynamic visual hinting works like this: When the cursor passes over a pliant object, it changes its appearance (see Figure 19-3). This action occurs before any mouse buttons are clicked and is triggered by cursor fly-over only, and is commonly referred to as a rollover. A good example of this is behavior of butcons (iconlike buttons) on toolbars: Although there is no persistent buttonlike affordance of the butcon, passing the cursor over any single butcon causes the affordance to appear. The result is a powerful hint that the control has the behavior of a button, and the elimination of the persistent affordance dramatically reduces visual clutter on the toolbar.
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Part III: Designing Interaction Details
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Figure 19-3 The buttons on the left are an example of static visual hinting: Their clickability is suggested by the dimensional rendering. The toolbar butcons on the right demonstrate dynamic visual hinting: While the Bold toggle doesn t appear to be a button at first glance, passing the mouse cursor over it causes it to change, thereby creating affordance.
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Pliant response hinting should occur if the mouse is clicked (but not released) while the cursor is inside a control. The control must visually show that it is poised to undergo a state change (see Figure 19-2). This action is important and is often neglected by those who create their own controls. A pushbutton needs to change from a visually raised state to a visually indented state; a check box should highlight its box but not show a check just yet. Pliant response is an important feedback mechanism for any control that either invokes an action or changes its state, letting the user know that some action is forthcoming if she releases the mouse button. The pliant response is also an important part of the cancel mechanism. When the user clicks down on a button, that button responds by becoming indented. If the user moves the mouse away from that button while still holding the mouse button down, the onscreen button should return to its quiescent, raised state. If the user then releases the mouse button, the onscreen button will not be activated (which is consistent with the lack of pliant response).
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Cursor hinting
Cursor hinting communicates pliancy by changing the appearance of the cursor as it passes over an object or screen area. For example, when the cursor passes over a window s frame, the cursor changes to a double-ended arrow showing the axis in which the window edge can be stretched. This is the only visual affordance that the frame can be stretched.
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Use cursor hinting to indicate pliancy.
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Cursor hinting should first and foremost make it clear to users that an object is pliant. It is also often useful to indicate what type of direct-manipulation action is possible.
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